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  Subjects -> CHEMISTRY (Total: 767 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (532 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (24 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (64 journals)

ANALYTICAL CHEMISTRY (45 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 198)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 8)
Acta Analytica     Hybrid Journal   (Followers: 6)
Advances in Analytical Chemistry     Open Access   (Followers: 17)
American Journal of Analytical Chemistry     Open Access   (Followers: 25)
Analytica Chimica Acta     Hybrid Journal   (Followers: 32)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 25)
Analytical Chemistry     Full-text available via subscription   (Followers: 289)
Analytical Chemistry Insights     Open Access   (Followers: 15)
Analytical Letters     Hybrid Journal   (Followers: 7)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 2)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 22)
Current Analytical Chemistry     Hybrid Journal   (Followers: 5)
Drug Testing and Analysis     Hybrid Journal   (Followers: 3)
Electroanalysis     Hybrid Journal   (Followers: 3)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 19)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 2)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 4)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 3)
ISRN Analytical Chemistry     Open Access   (Followers: 13)
ISRN Chromatography     Open Access   (Followers: 1)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 4)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 7)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 14)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 2)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 2)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 18)
Main Group Metal Chemistry     Full-text available via subscription  
Microchemical Journal     Hybrid Journal   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
Surface and Interface Analysis     Hybrid Journal   (Followers: 12)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 17)
Trends in Environmental Analytical Chemistry     Hybrid Journal  
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
Journal Cover Journal of Analytical Chemistry
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   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
     Published by Springer-Verlag Homepage  [2210 journals]   [SJR: 0.322]   [H-I: 17]
  • Iron(III) selective fluorescence probe based on perylene tetracarboxylic
           diimide
    • Abstract: Abstract Responses of organic fluorophore, perylenediimide derivative N,N′-di[3-[2-(3-thienyl)ethyl]phenyl]perylene-3,4,9,10-bis-(dicarboxyimide) (PDI1) was investigated in polymer matrix of polyvinyl chloride (PVC) by emission spectrometry. Its response to Fe(III) ions was evaluated in terms of the effect of pH. The properties of time dependent response, reversibility, limit of detection, linear concentration range for the metal ion and repeatability characteristics of the sensing element also have been studied. The offered sensor exhibited remarkable fluorescence intensity quenching at pH 6.0 in the concentration range of 1 × 10−6 to 2.5 × 10−3 M Fe(III) ions. The reproducibility of the sensor membrane was investigated by alternately changing the solution between 1 × 10−4 M Fe(III) in Na2HPO4 (4 × 10−2 M) and NaH2PO4 buffer (2 × 10−3 M).
      PubDate: 2014-09-01
       
  • Electrochemical studies on lawsone and its determination in henna (       class="a-plus-plus">Lawsonia inermis) extract
           using glassy carbon electrode
    • Abstract: Abstract The electrochemical behaviour of lawsone at glassy carbon electrode (GCE) was investigated by using cyclic and differential pulse anodic stripping voltammetric (DPASV) techniques. Cyclic voltammetry was used to study the influence of pH on the peak current and peak potential. The Mcllavnie’s buffer of pH 3.0 was selected as a suitable analytical medium in which lawsone exhibited sensitive diffusion controlled redox peaks (vs. Ag/AgCl). The peak current varied linearly with lawsone concentration in the range between 0.60 and 1.40 μM with a detection limit of 6 nM. The applicability of the proposed method was illustrated by the determination of lawsone present in real samples. A mean recovery of lawsone in the leaf of Lawsonia inermis was 99.5% with a relative standard deviation of 1.15%.
      PubDate: 2014-09-01
       
  • Rapid screening and determination of nerve agent metabolites in human
           urine by LC-MS/MS
    • Abstract: Abstract Qualitative screening procedures have been developed for the rapid detection and identification of the metabolites of nerve agents in the urine samples and extracts using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The combination of negative electrospray ionization (ESI) using a C18 column and water-methanol mobile phase modified with ammonium formate provides a rapid screening procedure for nerve agent degradation products with limit of detection of 1 ng/mL in the precursor-ion analysis. Also, determination of the alkyl methylphosphonic acids was carried out by the SRM scan mode with the limit of detection of 0.1 ng/mL. These procedures will be applicable to the trace analysis of metabolites of nerve agents in human urine matrices in the Organisation for the Prohibition of Chemical Weapons (OPCW) proficiency test.
      PubDate: 2014-09-01
       
  • Electrochemical investigation and determination of ceftazidime in
           pharmaceutical dosage forms and human urine
    • Abstract: Abstract A voltammetric study of the oxidation of Ceftazidime (CEFT) has been carried out at the glassy carbon electrode by cyclic, differential pulse (DPV) and square wave (SWV) voltammetry. The oxidation of CEFT was irreversible and exhibited diffusion controlled process depending on pH. The oxidation mechanism was proposed and discussed. According to the linear relationship between the peak current and concentration, DPV and SWV voltammetric methods for CEFT assay in pharmaceutical dosage forms and human urine were developed. For analytical purposes, a well resolved diffusion controlled voltammetric peak was obtained in 0.1 M H2SO4 at 1.00 and 1.02 V for differential pulse and square wave voltammetric techniques, respectively. The linear response was obtained within the range of 4 × 10−6−8 × 10−5 M with a detection limit of 6 × 10−7 M for differential pulse and 4 × 10−6–2 × 10−4 M with a detection limit of 1 × 10−6 M for square wave voltammetric technique. The determination of CEFT in 0.1 M H2SO4 was possible over the 2 × 10−6–1 × 10−4 M range in urine sample for both techniques. The standard addition method was used for the recovery studies.
      PubDate: 2014-09-01
       
  • Determination of cefazolin by oscillographic polarography as its        class="a-plus-plus">S,       class="a-plus-plus">S′-dioxide
    • Abstract: Abstract A simple rapid method is proposed to determine cefazolin in neat substances and powders for preparing injection solutions based on the preliminary oxidation of the preparation in weak acidic media by potassium peroxomonosulfate to respective S,S′-dioxide followed by its determination by oscillographic polarography. The concentration of the title material in the cefazolin substance was found to be 96.7%, RSD = 3%, δ= 2.4% and in the powder, 97.7%, RSD = 3%, δ = 2.3%.
      PubDate: 2014-09-01
       
  • Separation of vanadium(IV) from vanadium(V) and its determination in the
           presence of thiocyanate ions using two-phase aqueous systems
    • Abstract: Abstracts A two-phase system of polyethylene glycol PEG-1500 (C2H5OH, C3H7OH)-ammonium sulfate-water is proposed for the selective extraction and spectrometric determination of vanadium(IV) as its thiocyanate complex. The conditions of the separation of vanadium(IV) from vanadium(V) are optimized using polyethylene glycol or water soluble alcohols. The detection limit for vanadium(IV) in extractionatomic absorption determination is 2.8 μg/L and in combined photometric determination with chromazurol S, 10 μg/L. The methods are tested on mine, waste, and river waters. The relative standard deviation does not exceed 7%. The duration of analysis is 20 min.
      PubDate: 2014-09-01
       
  • The behavior of polyaniline-coated PVC membrane based on
           7,16-didecyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane for ph
           measurements in highly acidic media
    • Abstract: Abstract Polyaniline (PANI) chemically coated on polyvinylchloride (PVC) membrane based on a neutral carrier 7,16-didecyl-1,4,10,13-tetraoxa-7,16-diazacyclooctadecane (Kryptofix 22 DD) as the active component has been developed for determination of pH values ranging from pH 0.1–1. Effect of experimental parameters such as membrane composition, nature and amount of plasticizer, lipophilic additives and thickness of PANI film on the potential response of the pH electrode was investigated. The electrode has an apparent Nernstian response slope of 54.5 ± 0.4 mV/pH (at 20°C). The equilibrium water content of the electrode was determined in pure water and NaCl solution (I = 0.1 mol/kg). The electrode had low electric resistance, good potential stability and reproducibility (±1.5 mV, n = 10). It had a rapid potential response to changes of pH (15 s). The excellent performance in terms of linearity, stability and fast response makes this device suitable for pH measurements in highly acidic media.
      PubDate: 2014-09-01
       
  • Flow-injection and sequential injection determination of hydroxypurines on
           an electrode modified with mixed-valence ruthenium and iridium oxides
    • Abstract: Abstract Mixed-valence ruthenium (RuO x ) and iridium (IrO x ) oxides and composites on their basis (RuO x -IrO x or IrO x -RuO x ) electrodeposited onto the surface of a glassy carbon electrode exhibit a catalytic activity in the electrooxidation of uric acid, xanthine, and hypoxanthine. The transition from metal oxides to composites of two mixed-valence metal oxides leads to an increase in the catalytic effect of the oxidation of hydroxypurines. The IrO x -RuO x composite demonstrated the highest catalytic activity. Procedures for the amperometric detection of hydroxypurines on this composite electrode under the conditions of flow-injection analysis (FIA) and sequential injection analysis are proposed. A linear dependence of an analytical signal on the analyte concentration is observed in the range 1 × 10−6 to 5 × 10−3 M for uric acid and xanthine and 5 × 10−7 to 5 × 10−3 M for hypoxanthine under FIA conditions and from 5 × 10−7 to 5 × 10−3 M for uric acid and xanthine and 5 × 10−9 to 5 × 10−3 M for hypoxanthine in sequential injection analysis. Under FIA conditions, the sensitivity, rapidity, and performance of the analysis increase compared to the stationary conditions. The advantages of sequential injection analysis over FIA include a lower consumption of the supporting electrolyte; the absence of pumps and connections; and an increase in sensitivity, reproducibility, and rapidity.
      PubDate: 2014-09-01
       
  • Evolution of new narcotic substances and methods of their determination
    • Abstract: Abstract History of the appearance and evolution of synthetic narcotics in recent years is presented. The main attention is paid to two classes of narcotic substances received the widest distribution in the world, i.e., cannabimetics and synthetic cations. The main classes, problems of identification, and approaches to the determination of new narcotics are considered. Approaches and solutions used in the quantitative analysis and screening of narcotics are discussed along with some aspects of sample preparation to their determination and matrix effects. The specific features of the determination of new narcotics in commercial products and biological samples are considered separately. Present-day methods of chromatography-mass spectrometry are most informative for timely revealing new narcotic substances, studying their metabolism, and developing reliable methods for the screening of native and biological samples.
      PubDate: 2014-09-01
       
  • Nanostructure-based electrochemical sensor for determination of
           glutathione in hemolysed erythrocytes and urine
    • Abstract: Abstract A sensitive and selective electrochemical method was developed for the determination of glutathione (GSH) in hemolysed erythrocyte using vinylferocene modified carbon nanotubes paste electrode (VFMCNTPE). The results indicate that the electrode is efficient in terms of its electrocatalytic activity for the oxidation of GSH, leading to a reduced overpotential by more than 470 mV. Also, the values of catalytic rate constant (k), and diffusion coefficient (D) for GSH were calculated. The electrocatalytic oxidation peak current of GSH showed two linear dynamic ranges with a detection limit of 0.09 μM GSH. The linear calibration ranges were obtained between 0.2–4.0 and 4.0–250.0 μM GSH using square wave voltammetry (SWV) method. The proposed method was also examined as a selective, simple and precise electrochemical sensor for the determination of GSH in real samples such as urine and hemolysed erythrocyte.
      PubDate: 2014-09-01
       
  • Low density miniaturized homogeneous liquid-liquid extraction: a new high
           throughput sample preparation technique for the determination of polar
           pesticides in cow milk
    • Abstract: Abstract The application of miniaturized homogeneous liquid-liquid extraction (MHLLE) technique as a simple, inexpensive, quick and efficiency clean up method has been evaluated for determination of diazinon, alachlor, chlorpyrifos and butachlor in cow milk samples. Methanol was used as extraction solvent for the extraction of analytes from cow milk samples and then, methanol phase was extracted and cleaned up by MHLLE method. In this method, butyl acetate was added to methanol phase and after addition of water, butyl acetate was separated from methanol phase and injected to the GC/TSD instrument. The concentration ranges were from 1.0–1000.0 ng/mL for diazinon and chlorpyrifos and from 5.0–1000.0 ng/mL for alachlor and butachlor. The limits of detection were 0.4, 1.6, 0.3 and 1.4 ng/mL for diazinon, alachlor, chlorpyrifos and butachlor, respectively. Finally, the extraction method was successfully applied to the analysis of raw cow milk samples.
      PubDate: 2014-09-01
       
  • European Analytical Column Number 42
    • PubDate: 2014-08-01
       
  • Simple, rapid and sensitive method for the determination of mefenamic acid
           in pharmaceutical preparations
    • Abstract: Abstract Two simple and fast automated methods for the direct determination of mefenamic acid (MEF) in pharmaceutical samples are described. Continuous flow and stopped-flow systems with spectrophotometric detection of mefenamic acid with sodium nitroprusside and hydroxylamine hydrochloride were developed. Both methods show a good reproducibility (RSD < 1.5 and 1.8%, respectively) and a wide range of linearity (between 10–500 and 3–300 μg/mL). The stopped-flow protocol has a lower detection limit (1.2 μg/mL) with a sensitivity of about two times greater than the continuous flow technique. The proposed procedures are rapid, reliable and can be applied successfully to the estimation of mefenamic acid in different commercial forms.
      PubDate: 2014-08-01
       
  • Comparative investigation on chemical constituents of flower bud, stem and
           leaf of Lonicera
           japonica
    Thunb. by HPLC-DAD-ESI-MS/MS       class="a-plus-plus">        class="a-plus-plus">n and GC-MS
    • Abstract: Abstract In approaches of HPLC coupled with diode array detector tandem multiple mass spectrometry (HPLC-DAD-ESI-MS/MS n ) and GC-MS techniques, efficient comparative methods were developed to profile the chemical constituents in flower bud, leaf and stem parts of Lonicera japonica Thunb. (LJT). 22 polar compounds of various chemical structures and 19 volatile or semi-volatile compounds were tentatively identified from aerial parts of the plant. A number of common composition groups in three separate parts of the plant were proposed, including phenolic acids, flavonoids, iridoids, alkanes, olefins and sterols, the leaf showing higher similarity with the flower bud part via their chemical constituents. Considering the fact that the leaf part has a lot of similar components with the flower bud, this study indicates the leaf part of LJT can be expected to be used as an alternative medicinal resource to the flower bud and stem of the plant.
      PubDate: 2014-08-01
       
  • The composition of commercial acetylated glycerol samples determined by
           13C and        class="a-plus-plus">1H NMR. The comparison with
           gas chromatography
    • Abstract: Abstract A convenient method for the analysis of commercial acetylated glycerol samples based on 13C NMR is presented with the accuracy comparable to the standard gas chromatography approaches. The advantage of method is that it does not need any sample derivatization procedure by silyl groups and its application is much more straightforward, as compared to the published 1H NMR method.
      PubDate: 2014-08-01
       
  • Determination of acysole in whole blood by high-performance liquid
           chromatography
    • Abstract: Abstract A method is developed for the determination of a carbon monoxide antidote acysole in whole blood using hydrophilic interaction high-performance liquid chromatography with UV detection. Two methods were used for sample preparation: protein precipitation with acetonitrile and solid-phase extraction (SPE) with an acysole recovery of 95.8 and 89.8%, respectively. Chromatographic determination was performed in the isocratic mode on a Nucleodur HILIC column and with an acetonitrile: water 95: 5 mobile phase at 225 nm. The calibration graphs are linear in the concentration range 0.056–111.1 μg/mL. The limits of detection and determination of acysole were 0.050 and 0.120 μg/mL after protein precipitation with acetonitrile and 0.071 and 0.169 μg/mL with SPE, respectively.
      PubDate: 2014-08-01
       
  • Voltammetric determination of sterically hindered phenols in
           surfactant-based self-organized media
    • Abstract: Abstract Tert-butylhydroquinone (TBHQ), butylhydroxyanisole (BHA), and butylhydroxytoluene (BHT) are irreversibly oxidized on a glassy-carbon electrode in a medium of acetonitrile-Britton-Robinson buffer solution (1: 9, pH 3.0) at 0.61, 0.79, and 1.1 V, respectively, to give quinones. Micellar media of Triton X100,Brij® 35, and sodium dodecyl sulfate affect their oxidation. The splitting and suppression of the oxidation steps for sterically hindered phenols (SHP) is observed in the presence of nonionic surfactants. Sodium dodecyl sulfate considerably enhances anodic currents and also shifts positive potentials to lower values. The conditions of the differential-pulse voltammetric determination of SHP in a 0.1 M sodium dodecyl sulfate supporting electrolyte are found. The calibration graphs are linear in the ranges 2.02–1010, 2.34–1170, and 6.15–615 μM and the detection limits (S/N = 3) are 0.23, 0.18, and 3.5 μM for TBHQ, BHA, and BHT, respectively. The possibility of determining SHP in TBHQ-BHT and BHA-BHT mixtures in wide ranges of component concentration is demonstrated. A method is developed for the extraction-voltammetric determination of BHT in vegetable oils.
      PubDate: 2014-08-01
       
  • Simultaneous determination of ten constituents in herbal formulation
           Sipjeondaebo-tang using HPLC-PDA
    • Abstract: Abstract A simple, rapid, and accurate high-performance liquid chromatographic method was applied to the quantitative determination of 10 components, namely, 5-hydroxymethyl-2-furaldehyde, albiflorin, paeoniflorin, liquiritin, ferulic acid, nodakenin, coumarin, cinnamic acid, cinnamaldehyde and glycyrrhizin in the traditional herbal formulation Sipjeondaebo-tang (SJDBT). All components were separated within 40 min using a Gemini C18 column maintained at 40°C. The mobile phase was composed of 1.0% (v/v) aqueous acetic acid and 1.0% (v/v) acetic acid in acetonitrile by gradient elution. The flow rate was 1.0 mL/min and the detector was a photodiode array (PDA) set at 230, 254, 280, 320, and 330 nm. The calibration curves showed good linearity (r 2 ≥ 0.9993) in different concentration ranges. The recovery of each component was in the range of 92.3–104.8%, with relative standard deviations (RSDs) less than 2.5%. The RSDs for intra- and inter-day precision were 0.09–2.8% and 0.07–3.2%, respectively. The amounts of the 10 components in SJDBT were in the range of 0.18–5.77 mg/g.
      PubDate: 2014-08-01
       
  • Direct determination of antibacterial norfloxacin in urine by isopotential
           fluorimetry
    • Abstract: Abstract A novel and simple method is presented for the determination of norfloxacin in human urine by matrix isopotential synchronous fluorescence spectrometry (MISF). This method is useful for the determination of compounds in samples with unknown background fluorescence, such as norfloxacin in urine, without the need for tedious sample pre-treatment. The method was performed in ethanol-water medium (10% v/v), at an apparent pH of 4.8 provided by adding sodium acetate-acetic acid buffer solution. In the determination of norfloxacin in urine the fluorescent intensity varied linearly with its concentration from 20 to 200 ng/mL. An exhaustive statistical analysis has been developed to all calibration graphs, this treatment includes robust regression such as least median of squares, which also detects outliers and leverage points. The overall least-squares regression has been applied to find the more exact straight line that fits the experimental data. The error propagation has been considered to calculate the detection limit and the repeatability of the method. The method shows very low detection limits with acceptable recoveries and precisions. The applicability of the proposed method was illustrated in the determination of norfloxacin in human urine sample without sample pre-treatment.
      PubDate: 2014-08-01
       
  • Possibilities of micro X-ray fluorescence spectrometry of solutions with
           preconcentration
    • Abstract: Abstract Results of investigations in energy-dispersive X-ray fluorescence analysis aimed at the development of a high-sensitivity method of microanalysis of solutions are presented. A combined scheme of analysis of one drop of solution of the volume several microliters is proposed and tested. The scheme includes a new preconcentration method based on the drop evaporation in the presence of a micrograin of a hydrophilic adsorbent followed by the microanalysis of the solid phase on the portable device with a polycapillary lens with a focal spot of 10 μm designed at the Institute of Physical Optics. Analytically meaningful X-ray fluorescence spectra are obtained using DETATA (grain diameter about 100 μm) and SAC8 (50 μm) adsorbents and individual drops of model solutions containing Mn, Fe, Co, Ni, Cu, and Zn (0.2 mg/L and higher) and analytical characteristics of the proposed approach are demonstrated.
      PubDate: 2014-08-01
       
 
 
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